"Closing the Strait of Hormuz for Iran's armed forces is really easy ... or as Iranians say it will be easier than drinking a glass of water," Iran's navy chief Habibollah Sayyari told Iran's English language Press TV.
Sure, step one is easy. Iran could close Hormuz.
But we'd take the next 11 steps to recovery from that. We'd reopen the strait and the rest of the world would be in such a panic over their oil supplies that they'd join us. Iran would find themselves drinking from a fire hose.
And we would not let Iran use the Strait of Hormuz if they go through with their threat, so Iran would have very little income at all (just what they could get shipping oil by truck overland to neighboring countries through smuggling) and would get very little refined oil products imported (by the same overland routes).
Also, we'd sink the Iranian fleet and pound any shore installation like air bases or missile launchers that attempt to keep the Strait of Hormuz closed.
